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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a08cb43b1806fa67bd6b62ab44042a4ca432b146985649a6321a028381715b' 
  AND token = 'J+DadThnF3Rtx9jukoJDyoENVtrFfxEghs97aZiHMMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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