SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed1dff5b97d16747143c7aff43b5dfd4d53b8128816e65356e7203a2b3756bd' 
  AND token = 'w+/rFKBYLPSUdABHKKzAMUluONkOh8v+2brutGQ10yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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