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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0becee897c290650b7716cd140ea1de137f0f428bc3331b68b59ee5d745d7a' 
  AND token = '1gb/HX//0APiZMQoLYHSquvUS3iWzBU5P8l3frWts+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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