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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65adc0b891ca8169d7148588c1615dceb61cd10333afa2e3ea89e577b5738233' 
  AND token = 'dyDyqlARUEEyBIN3YdkWf7J977MEKfAV05p6on+7qD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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