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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e662592998cd495d38d2caca259193d9219d993cbb60e5f7291953d18c333432' 
  AND token = '6Aec0RQdK1Rdx1YDWM6n1PzjPuoYjmcupJa7Lev2HUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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