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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f5eb8324537622cc10891f643b11fa314bf6b91b2af0b56167f16122b3cd69' 
  AND token = 'yOuWFmCirOoFHOdO/ijgbAwblWNjoH7WAwMKa72zBVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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