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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42214b9c1ba7942b455250f8d2e5d9ac2a3f1e94bf00cb3df54d47a375d3e9b7' 
  AND token = 'ZklMJxuoWPzCVIm9Io80Yzz72vd7W9Lt8ugPJVHq3hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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