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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f25ec139e51b3060a688a19e45c8f92f51b4a5a0ccc0ee531460a4e3b84e71' 
  AND token = 'uadoDT0wwNxrdoNVU5CpWV/QRqMUUNzHIqpOKdOZZ/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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