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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e479bc52723f9de7e9f842ba0d028a94c90e21c1a4dbf4153ffb2772c556fa' 
  AND token = 'IfjGtpJvsoQZcFWa99TKUXKafW4et0w+Dc4id+joqGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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