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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b66e0e6a9588708e0de930544e419add560072a7c6041e9e3b555d62e52f79' 
  AND token = 'EzuafuypFEt4vDQ2vWA2OOG1ryjkdh+WKKxerdgNgkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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