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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502c38f110bd9b7683aa0d479e1b0eb51fa7eaade9c6dd1af08f0ccb79913dae' 
  AND token = 'ayzXL5ADzHGmVUboSBn4YOXKm5XbdxnQZDGNKsZnZNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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