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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4701f7ec399d89d254d1e8a250be440a928ea06874a660a6cfaeaf0cff67c132' 
  AND token = '4pO5Fr/eeMscRjvJhhp14JLg5n4l6avXAzGq1EllRck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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