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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c83ba556af8a5758ee052aaf3d836d17228e9345ed30e32c2c806cf3ef1fa1' 
  AND token = 'BhQM+451Ll+wWTRhcRUqV0ve4evYRL1Y/txHSi7k5D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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