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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c192a6ecfc07ca37eaae9df178337bdb474a63f3f6081d4e0a1a6b47b7855c4' 
  AND token = 'LhwP1JXR7BdJJ78J2uG20MBpN+/vqjRSfIp9vElTld8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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