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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193cbc07e3a6cb741c3aa54116e19a35a307c73faf9cd001d7a56c7aaf472ab9' 
  AND token = 'yLviURu9nxcoMyqqcoS5vw0IO/VR/UAldUv8eAwvN60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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