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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '130678eb8c5f2732e7b8828703c0f0076ef0456f0780ae3530dc2a9e262f0fab' 
  AND token = 'oH7ENFSdO8AH6T5Gffc2cEPlsWYhBUOHqGicQCVNn9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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