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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f029af5588a7e485d6ce9172e9ab0807d884a965e2dd50feaa1a232771bb1c31' 
  AND token = '30liFA/k1G1POrLvk3Pkk1oJQu3XLu6SqKSOHsq5eeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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