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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b9843196231672dc33ecc9f342e18dd1de92962bb0c52e6054937493806416' 
  AND token = 'C9VpxJ9kP2mljauazKNmlzb9EvOEMOxRUUJRXjsvb7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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