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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a487363ca3e77fed0e761e60eff00f10a9190c2791e5786190fff38c2e7978' 
  AND token = '3GHkN3xHygad3EcGc/jy0vUdqsJOp3uB5D0pu0xm7C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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