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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9498719b50f88a8952acc717b2a5a4753b27e9a24f5b1b190b41d412404857cb' 
  AND token = '3oGeMtL6uA1MrIrVrFXJtgovImH9eLHLowAQ145vE/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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