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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd449fcd063827b9af50d44761693722db357897365b971fa34a5fa073e9280b3' 
  AND token = 'QgJ7FGNWsk1Hl3HSr4cfAaPA8IbuiIlTp47lCKJTIpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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