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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb39a5070d981b619723bea821925c9544aedb1175331e0bc3f473b939495956' 
  AND token = 'I+PhwWvj2Tm7NR5wsyyd5re+o+7Ao7EnyXVRoI9XVxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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