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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74dac3b5f18220cb419e27036a0afdfe8ea34afe83c2727aaeba815df8c6a686' 
  AND token = 'ekTxqBlvmjOtF5Qoe1KbCD7wiRqHq5/eDdOTyWmO/1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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