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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7823de75c491a4758e0f615c091440771b619461c843e0c8e66dc474f3f802' 
  AND token = 'okKyv7eMY3PB43tWWuAYeWtj5ednBb60sEHd6Ooo2XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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