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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84f6dbf5f3ca3f9db3ef51f4425d9c4411c38204ff29c99dec3c42620922507' 
  AND token = 'qmUFXNOpY17xbrkrW24vWdn7Waefqrcs1d3TGeYC14w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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