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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c19f5faddd2dc4dee364265739c2f05cdb24d6214a46c35a281ba6f4544f5c3' 
  AND token = 'u+yGXZKv2nSDozJ/9Ape06W0zHfqeuU83WLOx7/jo+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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