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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ec005c9e71a83f6eec4940075a514da89fc92226ea888ca92b711224b5ba7b' 
  AND token = '/X9PMFzZE3TaiBiPLWp4eaU6m2qN7Vu/me5Of8Lqo4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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