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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432593e81c041e50fdf8a1867e47559f27ca25d1297def49070e62392c655e5f' 
  AND token = 'nKAZ6wSXoTnCE5NqJSCbwhTsytEv64mSq6xRxracGfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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