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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd328a9b08bab100f3cc033b6ccbac9fd5a2daa64fab8a9330fb0488057f68b5' 
  AND token = 'MpfXd7lqoK3mRWFXp7RUefN7qwYjtyraqWO23cZc24M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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