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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8e207d3a29eb3833c56284d1a58c205cd5917a8f86946a0f4d365e0b6d9c1c' 
  AND token = 'rVNUb0pGy7FICoxM7nHTYDou+GVc+aM/V6C0rdCpGTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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