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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f57e91a489b4a17d1424872db38187b1edf3bf4cd90d7895130e7841b2cd40d' 
  AND token = 'zvYWUYpATD3VISh36Vg9vFUU5xXMCwiR95xmUKQOnsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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