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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52b279aa21be0ccd7b418beb043a087b26f4d969d229ded2c5cd17809dc5b52' 
  AND token = 'MT83olcmU570JMJhYgYo5aQ1eILUF3y0yagqS3KJq44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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