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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984257d0279f5e318aec8a86102f815fe5a017aac6cf88364fda1b9bf9cecf9f' 
  AND token = 'WoAePf1LOkmMSiJN7nJf6plWj8jPXW+Moke1x/Wabew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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