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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a91f488519a28588eba713da4661153cb01f09f08036c65d594ae06fed9ffdc' 
  AND token = 'wmd4DeVtzMVM6szzZ8GjK5pQAg7kfk89d1TdwgVkWi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}