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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3332a0ee18238e62434a73737716bf984ec4b05286a28d5d1cb841c5478f59c0' 
  AND token = 'mSKdVONK2qvcoXTDh/8S/AX4CL923Y2BUbfAu6brX1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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