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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c9cd4c48655a66b0d57ef7a544429794d81869d93f06580078f4e8a9c0e6f5' 
  AND token = '64WHZB0TUqHfHAF31O11usrgXM2cXfYRnqvQbPHrYdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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