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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e2ac430dbfb874fd72680745d5b58c333f44b3c2c0f7502f47de6a9affc321' 
  AND token = 'NqkbgjUs2CrNbQKxek0duwgnLOdW0n0N1TmeX3ieiAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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