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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61992a57ddfb0f215704a629f6c346c115b361f6ce6abc5c08a5ab81a4720fd7' 
  AND token = '19gIvDbZdC8VEuwllcimS5ThKgHCrUia/Hl8eAXwr6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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