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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566b1294fafb2be930f6567c50d4ecb32e521ba908c9268fa1d0fff25127f673' 
  AND token = 'HBMz1Cfkq2WlZag7CK4mw21Dmo+uBTHtcx5fn1WoUzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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