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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685470989c1d43e43032786d48152f0b616e0606a97cfa8b0546e150095fa2fb' 
  AND token = 'ib9U0xwcWEvXQPwdW92uyc4Zl9+HEuiP9P1zzX7dufI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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