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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523ce8090ff78227934b40d46b5b395ea4ff1d1949a21fd7796aea3e40905a8b' 
  AND token = 'X5A5htLHt8qRrdnr7pC3ebnJr6Zyq/j/eg/Gv33Ttys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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