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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c3c9ec756d2f3136ca814fcc9614dadbeb84bae289ead6b9bfba9255c4e534' 
  AND token = 'z6WLkehP2/whdkd7Fx08+Yu8OenZB5DJiPOCfCzkals=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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