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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb93ae6f324d0cfa5aa2ca21502f05b2283716729d0c476262767a3a6a8ec4c' 
  AND token = 'WKA9a5G8Vj5h+l2iOerwzGVAStTV9NQ86GHCwxjFXnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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